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TS-Optics Boren-Simon 8 "f / 2.8 PowerNewton Astrograph

With the Boren-Simon-Powernewton you can achieve deep astro shoots in just one night, where usually many nights would be necessary.
And these recordings show through the professional ASA Reducer corrector a very good star sharpness without reflexes. Collect enough raw material for a truly final shot of the object in just one night!
The Benefits of the 8 "-f / 2.8-Power Newton:
♦ Short shutter speeds of f / 2.8 - ideal for uncooled DSLR cameras
♦ Moderate exposure times with narrow-band fog filters - ideal for use near the city
♦ Very good field sharpness by professional ASA Reducer / corrector
♦ High mechanical stiffness through carbontubus
♦ Length only 790 mm, weight only 7.6 kg - this is still carried well by transportable mounts
♦ Back focus 65 mm from the T2 thread - also suitable for off-axis guiding
♦ Illumination and correction up to APS chip format
♦ only 37% obstruction - visually usable
The Benefits of the 8 "f / 2.8 Astrograph over the Celestron Hyperstar System:
♦ The camera is located on the side of the tube, as in the Newton. Thus, neither the shading by the camera nor the waste heat in cooled CCD cameras affects the quality of the image.
♦ The system is open at the front, so it is faster cooled and less prone to dew
♦ The Astrograph offers a greater working distance than the Hyperstar, enabling the use of DSLR cameras or CCD cameras with filter wheels.

The TS UNCN2 V-Power focuser:

A key element of the TS PowerNewtons is the modern TS UNCN2 V-Power focuser. The pullout carries heavy cameras without tilting due to oversized ball bearings and a side guide. Only through this brief extract we were able to optimize the focal position. Despite the high light intensity, we have a catch mirror of only 74 mm diameter in the small axis, which reduces the contrast-reducing obstruction.

Other features and advantages:

♦ high rigidity with extremely short length
♦ generous back focus of 65 mm - enough space for all common coma correctors and the TS 9 mm Off-Axis Guider
♦ exact 1: 10 micro reduction - so succeed in perfectly focused Astroaufnahmen
♦ Engine focus expandable - with the TSACUMotorfok
Illumination and correction of the 8 "-1: 2.8 astrograph:
The back focus of the 8 "-f / 2.8-Powernewton is 65 mm.The Kodak KAF8300 sensor is very well illuminated and also well corrected.Even DSLR cameras with APS-C sensors can be used well.With a flat one gets the slight Randabschattung good away.

Switch from fast f / 2.8 to high-resolution f / 4 in minutes with the TSGPU coma corrector:
A telescope, two focal lengths - that's also possible with the Boren-Simon astrograph. With the optional TSGPU Aplanatic coma corrector optimized for f / 4 systems, turn the fast f / 2.8 astrograph into a high-resolution astrophotographically corrected Newtonian telescope with the aperture ratio of 1: 4 and 800 mm focal length.

The conversion takes place within a few minutes and the collimation remains completely intact.

The focus position on the Boren Simon is optimized for the ASA Reducer with about 90mm over the 2 "socket of the pullout - that's what the ASA needs, because of the focal length-reducing effect.The Boren Simon can even be combined very well with the GPU corrector without modification is the long construction of the GPU (with 100mm length).

The GPU is only partially pushed into the extract. About 25mm of the long 2 "socket still look out, which means you have to kill 2 birds with one stone:

♦ You automatically have a good position of the focuser for the corrector and you do not need an extension
♦ The long case of the proofer does not look clean into the tube

In order to get a clean attack, I recommend a 2 "counter ring (article number 2zKonter) .This could be the GPU even homofocal to ASA Reducer set, so you can immediately switch from the GPU to the ASA and vice versa.

For illumination: The secondary mirror in the Boren Simon is optimized so that a field lens on the tube level is fully illuminated. Whether that is the GPU or the ASA is not relevant. In both cases, the illumination is limited by the corrector itself (diameter telescope-side lens - distance to sensor). Every Boren Simon can do well with the GPU. A flat is of course always necessary, both with the GPU and with ASA.


Opening: 200 mm (8 ")
Focal length: 568 mm with reducer / corrector
Aperture: f / 2.8
Main mirror: 94% reflectivity - 200 mm
Mirrors: 94% reflection - 74 mm small axis
Corrector: 4-element ED corrector
Back focus: 65 mm distance to the optimal chip position
Focus position over tube: 140 mm - visually a 50 mm extension sleeve is required
Focuser: 2 "TS UNCN2 with 1/10 reduction
Threaded: T2 thread
Tube: 230 mm diameter - carbon tube with particularly high rigidity
Weight: 7.6 kg